JPH0260284B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention mainly relates to a hydraulic control system for a riding-type rice transplanter.

[Conventional technology]

This type of hydraulic control system uses a sensing valve to sense the levitation force applied to the float to control the elevation of the planting machine, and a sensitivity adjustment means to adjust the operating sensitivity of the sensing valve. A rice transplanter is known in which a common planting lever is used to switch between pressurizing, locking, and discharging a hydraulic cylinder that raises and lowers a planting machine, and also switches a planting clutch.

In this case, the hydraulic/planting common lever can apply operating force to the sensing valve to set the sensing valve in any one of the pressurized, locked, and discharged states. When the hydraulic pressure/planting common lever is not operated to lift or lock, the sensing valve automatically performs a switching operation according to the floating force applied to the float and the adjustment force applied by the sensitivity adjustment means, and This will switch between applying, locking, and releasing pressure to the cylinder to control the elevation of the planting machine.

Further, when the hydraulic/planting common lever is operated by the lift, the sensing lever is forcibly switched to realize pressurization of the hydraulic cylinder,
When the planting machine is lifted and then locked, the hydraulic cylinder can be locked and the lifted state can be maintained.

[Problem to be solved by the invention]

The problem with this type of hydraulic control is that it is controlled by a shared hydraulic/planting lever, so in the lifted state, the planting clutch is released and the planting machine cannot be operated. . For this reason, it is not possible to adjust the operation timing of the planting machine in the lifted state. Although the headland can be leveled with the hydraulic cylinder locked, the planting clutch is released and the planting machine cannot be operated. Therefore, when planting headlands, the sensitivity adjustment means must be used to lower the sensitivity of the sensing valve, and the hydraulic/planting common lever must be in a state where it does not forcefully control the sensing valve. Therefore, the sensitivity adjustment means must be operated during this headland planting.

In addition, when driving on the road, the hydraulic/planting common lever must be operated in the order of lift and lock to raise the planting machine, but if operated incorrectly, the planting machine will lower, causing the planting body to There is also a risk of damaging the float etc.

The present invention has been made to solve the above problems.

[Means to solve the problem]

In order to achieve the above object, the present invention controls the elevation of a planting work machine by sensing the levitation force applied to the float by a sensing valve, and adjusts the operating sensitivity of the sensing valve with a sensitivity adjustment means, And hydraulic
In a rice transplanter in which a common planting lever is used to switch between pressurizing, locking, and discharging the hydraulic cylinder that raises and lowers the planting machine, and also to switch the planting clutch, the above-mentioned hydraulic cylinder and the above-mentioned The present invention is characterized in that a switching valve capable of switching between communication and locking is provided between the sensor valve and the switching valve can be switched by an adjustment lever of the sensitivity adjustment means.

[Effect]

With the above configuration, the sensitivity can be adjusted freely while the planting machine is in a lifted state, and the headland can be planted with the hydraulic cylinder locked, and furthermore,
The lifted state of a planting machine can be reliably maintained when traveling on the road.

〔Example〕

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

In the figure, reference numeral 1 is a running body of a riding rice transplanter, and the running body 1 is equipped with a front wheel 2 as a steering wheel on the front side, and a rear wheel 3 on the rear side.
Part of the output of the engine mounted at the front of the vehicle body 1 is transmitted to the front wheels 2 and rear wheels 3, allowing the vehicle to travel on its own. Furthermore, the traveling vehicle body 1 has a control section consisting of a driver's seat 4, a steering wheel 5, etc.
A planting machine 7 is attached to the rear end of the traveling vehicle body 1 via a lifting mechanism 6 formed of a parallelogram link mechanism.

The above-mentioned planting work machine 7 has a seedling platform 9 disposed on the machine body 8, supported by slide guides 10 and 11, and a seedling retrieval port of a seedling receiving member 12 disposed corresponding to the lower end of the seedling platform 9. The planting body 13 can cut out and plant one pine-shaped seedling, and the planting work machine 7 is equipped with a center float 14 and side floats 15 on the lower side so that it can float above the field surface. There is. The center float 14 is connected to the fuselage 8 via a spool-type sensing valve 16 at its front portion. That is, in the sensing valve 16, the valve housing 16a is pivotally connected to the body 8, and the spool rod 16b is pivotally connected to the center float 14, so that the position of the spool 16c within the valve housing 16a is controlled by the force. It is configured to have three points: pressure position A, lock position B, and exhaust pressure position C.

Further, the sensitivity adjusting means 17 for adjusting the sensitivity of the sensing valve 16 includes links 17a and 17b that are pivotally connected to respective pivot points of the sensing valve 16, and both links 17a and 17b are connected to each other at one end. The inner wire 18a of the control wire 18 is connected to one link 17a via a spring 19. The inner wire 18a of the control wire 18 is connected to a sensitivity adjustment lever 20 provided on one side of the driver's seat 4, and a portion of the sensitivity adjustment lever 20 is connected to the vehicle body 1 via a universal joint. I support you. A control panel 21 corresponds to the lever 20, and there is a guide slit 22 having a locking groove 22a for selecting a sensitivity setting position and maintaining the sensitivity state, and the lever 20 passes through the guide slit 22. are doing.

A lock groove 22b is formed at one end of the guide slit 22 at a fixed position for locking the hydraulic cylinder.

A spool-type switching valve 23 is provided which is closed when the lever 20 is in the lock groove 22b and opened when the lever 20 is removed from there. The operating hydraulic cylinder 24 and the sensing valve 1
It is installed between the 6 hydraulic system lines.

The configuration of the hydraulic system path 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 16 and the switching valve 23, and pressure oil is supplied to the hydraulic cylinder 24. At this time, the elevating mechanism 6 can be raised. In addition, in the figure, the code 2
7 is a safety valve.

Further, on the other side of the driver's seat 4, a hydraulic/planting common lever 28 is provided, and passes through a guide slit 30 formed in the operation panel 29. The guide slit 30 has a planting position a in which a planting clutch (not shown) is turned on, a lift lowering position b in which the sensing valve 16 is placed in that position to discharge pressure from the hydraulic cylinder 24, and a lift lowering position b in which the hydraulic cylinder 24 is placed in a locked state. A neutral position c is provided in which the sensing valve 16 is placed in a lock position in order to do this, and a lift position d is provided in which the sensing valve 16 is placed in a pressurized position in order to supply pressurized oil to the hydraulic cylinder 24 and 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 b to the planting position a. As a result, the sensing valve 16 becomes free, and receives the floating force applied to the float 4 to move the spool rod 16b up and down, switching between three positions: pressurizing position, locking position, and exhausting position. The planting depth is automatically adjusted by switching between pressurization, locking, and exhaust pressure 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 sensing valve 16. Then, the lever 20 is operated to shift the lever 20 to the selected one of the lock grooves 20a, and 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 16. It is.

In addition, to interrupt rice planting work, move the hydraulic/planting common lever 28 from the planting position a to the lift lower position b.
, the planting clutch is released and the planting body 13 is stopped. When performing operations such as turning in the field, the hydraulic/planting common lever 28
is further switched to lift position d. By this,
The sensing valve 16 is forcibly set to the pressurized position so that pressurized oil is supplied to the hydraulic cylinder 24 and the planting machine is placed in a lift condition. Thereafter, when the oil pressure/planting common lever 28 is placed in the neutral position c, the oil passage of the hydraulic cylinder 24 is cut off, and the oil passage becomes locked.

In this case, the sensitivity adjustment lever 20 is
2a, the switching valve 30 is open so as to communicate between the hydraulic cylinder 24 and the sensing valve 16.

If it is necessary to drive the planting machine in the lifted state for the purpose of adjusting the planting timing in the planting machine, the sensitivity adjustment lever 20 is inserted into the lock groove 22b. As a result, the switching valve 23 is switched and the communication between the sensing valve 16 and the hydraulic cylinder 24 is cut off.
From now on, no matter how you operate the hydraulic/planting common lever 28, the hydraulic cylinder 24 will be maintained in the locked state, so return the lever 28 to the planting position a.
This means that the planting machine can be driven in the lifted state.

Further, even if the hydraulic/planting common lever 28 is accidentally removed from the lift position d 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, making it safer. Sexuality increases.

Furthermore, the headland can be leveled and planted while the float 14 remains in a predetermined lift state. That is, if the hydraulic/planting common lever 28 is set to the lift position and the planting machine is lifted to a predetermined level, and in this situation, the sensitivity adjustment lever 20 is placed in the locking groove 22b and the hydraulic cylinder 24 is locked. Thereafter, the hydraulic/planting common lever 28 is set to the planting position a, and planting work can begin. In this case, the sensing valve 16 will not function and the float 14 will be used with a constant load to effectively achieve rough headland leveling and also allow headland planting.

〔Effect of the invention〕

As described in detail above, the present invention provides a switching valve for switching between communication and locking between the hydraulic cylinder that raises and lowers the planting machine and the sensing valve, and also connects the switching valve to the sensitivity adjusting means. Since it can be switched using the adjustment lever, the planting machine can be operated in a lifted state, and leveling and headland planting can be done with the hydraulic cylinder locked.
Furthermore, when driving on the road, double hydraulic cylinder locks are set for both the hydraulic/planting common lever and the sensitivity adjustment lever, so the lift condition is ensured sufficiently and the excellent effect of high safety is achieved. can get.

[Brief explanation of the drawing]

Figure 1 is a side view showing one embodiment of the present invention, Figure 2 is a side view showing one embodiment of the present invention;
The figure is a plan view of the same, Figure 3 is a side view showing the control system of the sensing valve, and Figure 4 is a sensitivity adjustment lever and hydraulic pressure.
A plan view showing each operation position of the common planting 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...handle, 6...lifting mechanism,
7... Planting work machine, 8... Body, 9... Seedling mounting stand, 10, 11... Slide guide, 12... Seedling receiving member, 13... Planting 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 ,1
9... Spring, 20... Sensitivity adjustment lever, 2
1...Operation panel, 22...Guide slit, 22
a, 22b...Lock groove, 23...Switching valve,
24...Hydraulic cylinder, 25...Pump, 26...
...Oil tank, 27...Safety valve, 28...Hydraulic pressure/planting common lever, 29...Operation panel, 30...Guide slit.

Claims (1)

[Scope of Claims] 1. A sensing valve detects the levitation force applied to the float to control the elevation of the planting work machine, and the operating sensitivity of the sensing valve is adjusted by a sensitivity adjustment means,
In addition, in a rice transplanter in which the hydraulic pressure/planting common lever is used to switch between pressurizing, locking, and discharging pressure on the hydraulic cylinder that raises and lowers the planting machine, and also switches the planting clutch, the above hydraulic pressure is used. Between the cylinder and the above sensing valve,
A hydraulic control system for a rice transplanter, characterized in that a switching valve for switching between communication and locking is provided, and the switching valve can be switched by an adjustment lever of a sensitivity adjustment means.