JPH0333212Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a working device that is movable up and down via a hydraulic cylinder on a traveling vehicle body, a sensor that detects the ground level of the working device, and a control valve for the sensor and the hydraulic cylinder. and a lift control mechanism that moves and operates the control valve so as to maintain the control valve within a set range and the ground level detected by the sensor, and supplies pressurized oil to an actuator for driving other devices via the control valve. A combine harvester equipped with a cutting height control mechanism, a tiller equipped with a plowing depth control mechanism, or a control mechanism for making the planting depth constant, which is configured to be able to be supplied and has a human operating tool linked to the control valve. Regarding land-based work vehicles such as rice transplanters equipped with

In the above-mentioned work vehicle, it is preferable to slow down the lifting speed of the working device in order to perform the lifting control mechanism with high accuracy.On the other hand, it is better to make the lifting speed of the working device faster for turning, etc. at the edge of a field or rice field. It was favorable. Therefore, conventionally, for example, in a spool valve, the diameter of the annular oil passage formed on the outer periphery to communicate and connect the pump port and the supply port to the cylinder side is varied in the spool sliding direction.
The lifting speed of the working device is slowed down when pressure oil is supplied through the portion where the spool diameter is large.
However, in a state where only the large diameter portion is in communication, the rising speed changes greatly with respect to the unit movement of the spool, making it difficult to set the rising speed and requiring time and effort to process.

In addition, in conventional work vehicles, for example, in order to supply pressurized oil to the actuator for driving the ground equipment, such as the steering clutch operation cylinder that constitutes the steering control mechanism, in order to ensure the operation of the elevation control mechanism, , when the supply to the hydraulic cylinder is unnecessary via the control valve,
In other words, it was configured so that it could be supplied only during neutral and descending operations. However, even if an attempt is made to drive another device while the machine is traveling, pressure oil cannot be supplied to the actuator for driving the other device when pressure oil is being supplied to the cylinder based on the lift control mechanism, resulting in malfunction. Ta.

In view of the above-mentioned points, the present invention has been developed by making simple improvements that allow for low-speed elevation during elevation control and high-speed elevation during manual operation, while also allowing other equipment to be controlled even during elevation control. The purpose is to enable good operation.

In order to achieve the above object, the present invention, in the above-mentioned ground work vehicle, configures the manual operation tool so that the valve body can be freely operated within a larger range than the automatic control by the lift control mechanism, and A recess is formed for selectively communicating the supply port to the hydraulic cylinder and the carry-over port of the hydraulic actuator for driving another device with the pump port, and the pump port and the supply port are connected to each other. The pump port and the carry over port are communicated only in the upward movement side set range of the valve body in the communication state, and the valve body is moved to a position close to the upward operation limit exceeding the upward movement side set range. Accordingly, the valve body is characterized in that a small diameter oil passage for cutting off communication between the pump port and the carryover port is provided in the valve body.

The effects of the above configuration are as follows.

In other words, when the lifting control mechanism is used to raise the work equipment during normal work, a portion of the supplied pressure oil is flowed to the carry over port through the small diameter oil passage, and the lifting speed of the working equipment is slow.On the other hand, during manual operation, , the valve body is operated to or near its lifting operation limit, and communication between the pump port and the carryover port is cut off, and the entire amount of pressure oil from the pump port is supplied to the hydraulic cylinder, quickly moving the working equipment. It raises it.

The effects of the above action are as follows.

In other words, although the improvement is as simple as providing a small-diameter oil passage in the valve body, the lifting speed of the working device can be made slower when lifted using a normal lifting control mechanism and faster when lifted manually. , Pressure oil is supplied to the carry over port to slow down the lifting speed of the lift control mechanism, so for example, when raising the work equipment for turning the aircraft near the edge of a ridge, the work equipment can be manually operated. Pressure oil can be supplied to the actuator for driving other equipment to drive other equipment even when the work equipment is being raised by the control mechanism during normal work travel, other than when the work equipment is not being operated to raise the equipment. This prevents the operation of the direction control mechanism from being interrupted when the working device is raised, and allows other devices to operate smoothly while the working device is moving.

Hereinafter, embodiments of the present invention will be described in detail with reference to illustrative drawings.

Equipped with a crawler traveling device 1 and a control section 2
A reaping section 7 equipped with a pulling device 4, a reaping device 5, and a vertical conveyance device 6 is provided in the front part of the traveling vehicle body provided with the driver's seat 3, and is swingable up and down about the left-right axis Q of the vehicle body. A single-acting hydraulic cylinder 8 is interposed between the traveling vehicle body and the reaping section 7 to constitute a combine harvester.

A pair of ground sensors 10 and 1 are mounted on the frame 9 of the reaping section 7 to detect the ground level of the reaping section 7, which can swing up and down about the left-right axis axis _Q1 of the vehicle body.
0, and the sensors 10, 10,
A spring 11 is provided for biasing each of them toward the downward swinging side, and the sensors 10, 10,
A sliding type control valve 12 for the hydraulic cylinder 8 is linked via a release wire 13, and the control valve 12 is switched in accordance with the rocking displacement of the sensors 10, 10, thereby adjusting the detection ground level of the sensors 10, 10. The cylinder 8 is operated so as to maintain the height within a set range, and the elevation control mechanism is configured to maintain the height of the reaping section 7 from the ground, that is, the so-called cutting height, constant.

In order to interlock and connect the sensors 10, 10 and the control valve 12, a fork 16 linked to the spool 15 of the control valve 12 is rotatably attached to a spindle 17, and the spindle 17 is rotatably attached to a frame 18. It is fitted into the attached cylindrical shaft 19 so as to be relatively rotatable, and a first arm member 20 is connected to one end of the support shaft 17, and one end of the release wire 13 is connected to the first arm member 20. On the other hand, the cylinder shaft 1
Notch 2 having a predetermined length in the circumferential direction on one end side of 9
1 and 21, and a pin 22 fixed through the support shaft 17 is inserted into the notches 21 and 21, and a second arm member 23 is connected to the other end side of the cylinder shaft 19. and the second arm member 23
A human operating tool 24 is interlocked and connected to.

With the above configuration, during automatic elevation control, the operating tool 24 is fixed, and as the sensors 10, 10 are displaced, the spindle 17 is rotated within the range allowed by the notches 21, 21, and the spool 15, and during manual operation, the operating tool 2
4, the cylindrical shaft 19 is brought into contact with the pin 22, and the spool 15 is slid over a range larger than the allowable range during the above-mentioned automatic elevation control.

Reference numeral 25 in the figure indicates a connecting pin that connects the first arm member 20 and the second arm member 23, and 26 in the figure
shows a ball stopper that fixes the operating tool 24 in a state that allows automatic elevation control.

The control valve 12 includes a valve case 2.
7, a supply port P ₁ communicating with the cylinder 8;
A pump port P ₂ , a drain port P ₃ , and a carrier port P ₄ for supplying pressure oil to the electromagnetic control valve V ₁ of the left and right steering clutch operating cylinders 28 and 28 are formed; An annular recess 29 is formed on the outer peripheral surface of the pump port ₁₅ to selectively communicate the supply port P ₁ and the carryover port P ₄ with respect to the pump port P 2 . An oil passage R ₁ is formed in the spool 15, and the oil passage R ₁ and the pump port P ₂ are connected in communication, and the recess 29 is formed only within a setting range allowed by the notches 21, 21. A small diameter oil passage 30 is formed in the spool 15 to communicate the oil passage R ₁ and the carry over port P ₄ in a state where the oil passage R ₁ and the supply port P 1 are in communication with each other, and when the reaping part 7 is raised by the lifting control mechanism, i.e. , even when the spool 15 is moved to the left in FIG.
The pump port P ₂ and the carryover port P ₄ are communicated by a small diameter oil passage 30 so that the steering clutch can be disengaged, and the spool 1 can be manually operated beyond the allowable range by the notches 21 and 21.
5 is operated, the small diameter oil passage 30 is closed by the valve case 27, and the entire amount of pressure oil from the pump port _P2 is supplied to the supply port _P1 , so that the reaping section 7 can be raised at high speed.

An oil passage _r1 for taking out pilot pressure is formed at a predetermined location of the spool 15, and as the spool 15 moves, the piston ₃₁ for lowering operation is connected to the oil passage r1.
At the same time, the piston 31 is connected to a check valve 32 interposed in the oil path between the supply port P ₁ and the cylinder 8, and the action of the check valve 32 is forcibly released. The oil is drained from the cylinder 8 and the reaping section 7 is lowered.

The electromagnetic control valve ₁ for the steering clutch operating cylinders 28, 28 is connected to the weeding tool 3.
A sensor 3 for detecting the relative position of the grain culm row with the reaping part 7 provided on a predetermined part of the mounting frame 34 of No. 3;
Based on the detection result of step 5, the steering control mechanism 37 is configured to be automatically switched via the controller 36, and the steering control mechanism 37 is configured to run while steering the reaping unit 7 along the grain culm row. It is configured. A variable throttle valve 38 is interposed in the middle of the oil passage _r2 that communicates the control valve _V1 and the carryover port _P4 , and by adjusting the amount of throttle, the control valve 38 is adjusted during the lifting operation of the reaping part 7 based on the lift control mechanism. The amount of pressure oil supplied to the hydraulic cylinder 8, that is, the rising speed of the reaping section 7 can be changed and set.

In the present invention, for example, a conveyance device for adjusting the handling depth is configured to be displaced by a hydraulic motor in the middle of the vertical conveyance device 6, and the hydraulic motor is supplied with pressure oil from the carryover port _P4. Such a hydraulic motor or hydraulic cylinders 28, 2 for operating the steering clutch may be supplied.
Hydraulic actuator 28 for driving other equipment with 8 etc.
Collectively called.

The present invention is not limited to the above-mentioned spool valve.
It can also be applied to a rotary valve, and the spool 15, rotary valve body, etc. are collectively referred to as the valve body 15.

Further, the reaping section 7, tilling device, inplanting device, etc. are collectively referred to as the working device 7.

In addition, when detecting the ground level of the work device 7,
A non-contact type sensor such as an ultrasonic sensor may be provided, and the control valve 12 may be configured to be electromagnetic, so that the spool 15 may be slid in response to a signal from the sensor. Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

The drawings show an embodiment of the ground work vehicle according to the present invention, and FIG. 1 is a partially omitted side view of a combine harvester, and FIG.
The figure is a mechanism diagram showing the lift control mechanism, Figure 3 is a vertical sectional view of the main parts, Figure 4 is a sectional view taken along the - line in Figure 3, Figure 5 is a vertical sectional view of the control valve in the neutral state, and Figure 6 is a vertical sectional view of the control valve in the neutral state. This figure is a partially developed cross-sectional view of the main part of FIG. 5 and shows a steering control mechanism incorporated therein. 7... Working equipment, 8... Single acting hydraulic cylinder,
10... Sensor, 12... Control valve, 15... Valve body, 24... Human operating tool, 28... Hydraulic actuator for driving other devices, 29... Recess, 30... Small diameter oil path, P ₁ ... Supply port to the cylinder, P ₂ …
…Pump port, P ₄ …Carry over port.

Claims (1)

[Claims for Utility Model Registration] 1. A working device 7 is provided on the traveling vehicle body via a single-acting hydraulic cylinder 8 so that it can be raised and lowered, and a sensor 10 for detecting the ground level of the working device 7 is provided. Said hydraulic cylinder 8
The control valve 12 is provided with an elevation control mechanism that moves and operates the valve body 15 of the control valve 12 so as to maintain the ground level detected by the sensor 10 within a set range in conjunction with the control valve 12; In a ground work vehicle configured to be able to supply pressure oil to a hydraulic actuator 28 for driving other devices through a hydraulic actuator 28 for driving other devices, and in which a human operating tool 24 is linked to the valve pair 15 of the control valve 12, The human operating tool 24 is configured to be able to freely operate the valve body 15 within a range, and the valve body 15 is provided with a supply port AP ₁ to the hydraulic cylinder 8 and a carryover port P to the hydraulic actuator 28 for driving other devices. A _recess 29 is formed for selectively communicating the pump port P ₂ with the pump port P 2, and the valve body 15 is set on the upward moving side when the pump port P ₂ and the supply port P ₁ are in communication with each other. The pump port _P2 and the carryover port _P4 are communicated only within the range, and
A small-diameter oil passage 30 is provided in the valve body 15 to cut off communication between the pump port P ₂ and the carryover port P ₄ as the valve body 15 moves beyond the set range on the upward movement side and close to the upward operation limit. Ground work vehicle characterized by: 2. Utility model registration claim 1, wherein the actuator for driving the other device is a hydraulic cylinder 28, 28 for operating a steering clutch that constitutes an automatic steering control mechanism that causes the aircraft to travel along a predetermined line.
Ground work vehicle described in section.