JPS59143515A - Hydraulic control system in rice planter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a hydraulic control system for a riding-type rice transplanter.

In this type of hydraulic control system, a sensing valve detects the floating blade applied to the float to control the elevation of the working machine, and the operating sensitivity of the sensing valve is adjusted using a sensitivity adjustment means. A common planting lever is known that is used to switch between pressurizing, locking, and discharging a hydraulic cylinder that raises and lowers a planting machine, as well as switching a planting clutch.

In this case, the hydraulic/planting common lever applies the operating force to the sensing valve to pressurize and/or pressurize the sensing valve.
It can be set to either lock or exhaust pressure. When the hydraulic/planting common lever is not operated to lift or lock, the sensing valve automatically performs a switching operation in accordance with the adjustment force applied by the floating blade applied to the float and the sensitivity adjustment means, and This will switch between pressurizing, locking, and discharging the cylinder to control the elevation of the planting machine.

Furthermore, when the hydraulic/planting common lever is operated to lift, the sensing lever is forcibly switched to apply pressure to the hydraulic cylinder, lift the planting machine, and then When the lock is activated, the hydraulic cylinder can be locked and its lifted state can be maintained.

The problem with this type of hydraulic control is that since it is controlled by a shared hydraulic/planting lever, the planting clutch is disengaged in the riff 1 to state, and the planting machine cannot be operated. It is. For this reason, it is not possible to adjust the operation timing of the planting machine in the lifted state. Also,
The headland can be leveled with the hydraulic cylinder locked, but the planting clutch is released, so
I am unable to use the planting machine. Furthermore, in order to obtain the effect of leveling the headland, it is better to put the hydraulic cylinder in a state of pressure so that the load of the planting machine is applied to the float. Therefore, when planting headlands, the sensitivity adjustment means must be activated to lower the sensitivity of the sensing valve, and the hydraulic/planting lever must be in a state where it does not forcefully control the sensing valve. For this reason,
The sensitivity control means must be operated during this headland planting.

Also, when driving on the road, operate the hydraulic/planting (=l) common lever in the order of lift and lock, and use the hfj (I) method to raise the planting equipment, but if you operate it incorrectly, the planting equipment will lower. There is also a risk of damaging the planting body, float, etc.

The present invention was made in order to improve the above-mentioned drawbacks, and a switching valve capable of performing three-stage switching of pressurization, locking, and discharge is provided between the hydraulic cylinder and the sensing valve, and this is connected to the control lever of the sensitivity adjustment means. The planting machine can be operated in a lifted state, and the headland can be planted with the hydraulic cylinder discharged (released), and the planting machine can be switched in the lifted state when traveling on the road. The purpose of this paper is to provide a hydraulic control system for a rice transplanter that can reliably maintain the

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings.

In the figure, numeral 1 is the running body of a riding rice transplanter;
The front side of the traveling vehicle body 1 is equipped with a front wheel 2 as a steering wheel, and the rear side is equipped with a rear wheel 3. Part of the output of the engine mounted on the front portion of the traveling vehicle body 1 is supplied to the front wheels 2, The power is transmitted to the rear wheels 3, allowing self-blade travel. Furthermore, the traveling vehicle body 1 has a control section consisting of a driver's seat 4, a handle 5, etc., and a planting machine 7 is connected to the rear end of the traveling vehicle body 1 via a lowering machine 6 consisting of a parallelogram link mechanism. is installed.

The above-mentioned planting machine 7 has a seedling stand 9 disposed on the machine body 8 and is supported by a slide guide 10.11. It is possible to cut out and plant one mat-like seedling with the I-body 13, and the planting work machine 7 has a center float 14 and a center float 14 on the lower side so that it can float above the field surface. A side float 15 is provided.The center float 1 is provided with a side float 15.
4 is connected to the fuselage 8 via a spool-type sensing valve 1G at its front. That is, the sensing valve 16
The valve housing 1f3a is pivotally attached to the body 8, and the spool rod 16b is attached to the center float 14.
The spool 16c is pivotally attached to the valve housing 16a, and the spool 16c is configured to have three positions: a pressurizing position A, a press position B, and a discharging position C.

Further, the sensitivity adjustment means 17 for adjusting the sensitivity of the sensing valve 1G includes links 17a and 17b pivoted to each pivot point of the sensing valve 16, and both links 1
7a and 17b are pivotally connected to each other at one end, and an inner wire 18a of a control wire 18 is connected to one link 17a via a spring 19.

The control wire 18 is installed on one side of the driver's seat 4 (
The inner wire 18a is connected to the sensitivity adjustment lever 2o, and a portion of the sensitivity adjustment lever 2° is pivotally supported to the vehicle body 1 via a universal joint. A control panel 21 corresponds to the lever 2o, and there is a guide slit 22 having a lock groove 22a for selecting a sensitivity setting position and maintaining the sensitivity state. penetrates through.

Furthermore, a lock groove 2'2b is formed at one end of the guide slit 22 at a fixed position for locking the hydraulic cylinder, and a lock groove 22C is formed at a headland operating position for exhaust pressure.

A spool-type three-stage switching valve 23 is provided, which is closed when the lever 20 is in the lock groove 22b, pressurized when the lever 20 is removed from there, and released pressure when it is in the cock groove 22c. This switching valve 23
is installed between a hydraulic cylinder 24 that raises and lowers the elevator @6 and a hydraulic line of the sensing valve 16.

The configuration of the hydraulic system is shown in detail in FIG.

Here, the oil in the oil tank 26 is supplied by the pump 25 to the hydraulic cylinder 24 via the sensing valve 1G and the switching valve 23, and when pressure oil is supplied to the hydraulic cylinder 24, The elevating mechanism 6 can be moved to the upper arm. In addition, in the figure,
Reference numeral 27 is a safety valve.

In addition, on the other side of the driver's seat 4, there is a hydraulic/planting common lever 28.
is provided, and a guide slit 1 bored in the operation panel 29 is provided.
It passes through 30. In the guide slit 30,
4fl (ζ) clutch (not shown) is turned on. Planting position 81. Hydraulic cylinder 24. Pressure sensing valve 16 is placed in that position to discharge the pressure. Lift lowering position b. Hydraulic cylinder 24 is sensed in order to lock it. A neutral position C is provided in which the valve 16 is placed in a lock position, and a lift position d is provided in which the sensing valve 1G is placed in a pressurized position for supplying pressure oil to the hydraulic cylinder 24 to pressurize it.

Next, the operation of this hydraulic control system will be explained. When performing rice planting work in a field, the hydraulic/planting common lever 28 is moved from the lift lowering position 1 to the planting position a. As a result, the sensing valve 16 is in a free state, and the spool rod 16 is moved up and down in response to the floating blade applied to the float 4, and the three positions of the pressurizing position, locking position, and exhausting position are switched, and the hydraulic pressure is The planting depth is automatically adjusted by switching between pressurization, locking, and exhaust pressure on the cylinder 24 to maintain the relative level between the planting machine and the float within a certain range. in this case,
Depending on the hardness or softness of the field, it is necessary to change the set position of the sensitivity adjustment lever 20 in order to adjust the sensitivity of the Iwachi valve 16. Then, operate the lever 20 to lock the lock groove 2.
By shifting the lever 20 to the selected one of 0a, the tension of the spring 19 is changed by the tension of the inner wire 18a of the control wire 18, and this is applied to the sensing valve 1G.

To interrupt the rice planting work, the hydraulic/planting common lever 28 is moved from the "planting" position a to the lift lowering position, the planting clutch is released, and the planting body 13 is stopped. And li! When performing operations such as circulation in the iI field,
The hydraulic/planting common lever 28 is further switched to the lift position d. As a result, the sensing valve 16 is forced to the pressurizing position, so that pressure oil is supplied to the hydraulic cylinder 24, and the drafting machine becomes in a lift state. after that,
When the hydraulic pressure/injection (=l) common lever 28 is placed in the neutral position C, the hydraulic cylinder 24 cuts off the oil passage and enters the locked state.

In this case, the pestilence control lever 20 is in the lock groove 22a, so the switching valve 30 is opened so as to communicate between the hydraulic cylinder 24 and the sensing valve 1G.

If it is necessary to drive the planting machine in the lifted state for the purpose of timing adjustment or the like, the sensitivity adjustment lever 20 is placed in the lock groove 22b. As a result, the switching valve 23
is switched, cutting off the communication between the sensing valve 16 and the hydraulic cylinder 24. From now on, no matter how the hydraulic/planting common lever 28 is operated, the hydraulic cylinder 24 will be maintained in the locked state. After returning to the planting position a, the planting machine can be driven in the lifted state.

Furthermore, even if the common lever 28 is removed from the lift position d by mistake while driving on the road, the lift will not be lowered because the sensitivity adjustment lever 20 is in the lock groove 22b. . In this way, both the oil pressure/planting common lever 28 and the sensitivity adjustment lever 20 double ensure that the lifted state is maintained, so failures in lowering the lift can be sufficiently avoided when driving on the road, and safety can be improved. It increases.

Further, the headland can be leveled, planted, and damaged while the full load of the planting machine is applied to the float 14. That is, if the sensitivity adjustment lever 20 is placed in the lock groove 22C to discharge pressure oil from the hydraulic cylinder 24, then the hydraulic/planting common lever 28 is set to the planting (=1 position a) and the planting is started. In this case, the sensing valve 16 is not functional and the float 14 is used with a constant load to effectively achieve the leveling of the rough headland and to improve the headland planting. You will also be able to do this.

As described in detail above, the present invention controls the elevation of a planting work machine by sensing the floating blade applied to the float using a sensing valve, and also adjusts the operating sensitivity of the sensing valve using a sensitivity adjustment means, and hydraulic pressure.・The common planting lever is used to switch between pressurizing, locking, and discharging pressure for the hydraulic cylinder that raises and lowers the planting machine, and also to switch the planting (=l clutch). A three-stage switching valve that can switch between pressurization and lock exhaust pressure is provided between the sensing valve and the switching valve can be switched by the adjustment lever of the sensitivity vAwJ means. It can work in lift condition, and also
Headland planting can be performed by leveling and planting with the maximum load applied to the float with the hydraulic cylinder discharged (released), and furthermore, when driving on the road, both the hydraulic pressure/planting common lever and the sensitivity adjustment lever can be used. Since the hydraulic cylinder is heavily locked, the lift condition is sufficiently ensured and the excellent effect of high safety can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a side view showing one embodiment of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a side view showing the control system of the sensing valve, and Fig. 4
The figure is a plan view showing each operating position of the @degree adjustment lever and the hydraulic/planting common lever, and FIG. 5 is a circuit configuration diagram of the hydraulic control system. 1... Running vehicle body, 2... Front wheel, 3... Rear wheel, 4...
... Driver's seat, 5... Steering wheel, 6... Lifting mechanism, 7
...planting machine, 8...machine, 9...seedling platform,
io, 1i... Slide guide, 12... Seedling holder is a member, 13... Plant (=I body, 14... Center float, 15... Side float, 16... Sensing valve, 16a ... Valve housing, 16b... Spool rod, 16c... Spool, 17... Sensitivity adjustment means,
17a, 17b...Link, 18...Control wire, 18a...Inner wire, 19...Spring, 20...Sensitivity adjustment lever, 21...Operation panel, 22...Guide slit, 22a , 22b・
...Lock groove, 23...Switching valve, 24...Hydraulic cylinder, 25...Pump, 26...Oil tank, 2
7...Safety valve, 28...Hydraulic pressure/planting common lever, 2
9...Operation panel, 30...Kite slit. Patent applicant Noboru Kobashi, patent attorney for Iseki Agricultural Machinery Co., Ltd.

Claims (1)

[Claims] A sensing valve detects the floating blade applied to the float to control the raising and lowering of the planting machine, and the operating sensitivity of the sensing valve is adjusted by a sensitivity adjustment means, and a hydraulic/planting common lever controls the planting machine. In this system, the pressure is applied, locked, and discharged to the hydraulic cylinder that is lowered, and the planting clutch is also changed.・Equipped with a three-stage switching valve that can switch exhaust pressure,
A hydraulic control system for a rice transplanter, characterized in that the switching valve can be switched by a control lever of a sensitivity control means.