JPH0746929B2 - Machine control device for mobile work machine - Google Patents

Description

Detailed Description of the Invention

[Industrial applications]

The present invention relates to a body control device in a mobile work machine such as a walk-behind rice transplanter having a float and traveling wheels.

[Prior art]

For example, in a walk-behind rice transplanter, a float is provided on the grounding side of the rice transplanter body so that it can move up and down, and a variation in ground pressure applied to this float is detected, and a hydraulic cylinder that moves the rice transplanter body up and down via wheels is A swing control valve for controlling the supply of pressure oil is provided, and the swing control valve is a lift control lever, such as a planting clutch, which is separately operated when not planting (working), for example, when turning the aircraft headland. Controlled by a lever that also serves as a lever, a predetermined amount of pressure oil is supplied to the hydraulic cylinder so as to lower the wheels and lift the rice transplanter body to a predetermined height. Then, when the rice transplanter main body achieves a predetermined amount of lift, the swing control valve is forcibly returned to the neutral position, and the hydraulic cylinder is set to the blocked state.

[Problems to be Solved by the Invention]

The problem with this type of control device is that when the lift of the rice transplanter main body is achieved, but the rice transplanter (moving work machine) is further caught in the depth when turning the headland, the above valve is used. Is in the neutral position and the lift operation cannot be performed any further. For this reason, there are problems that the float may touch the ground to roughen the rice field or make it difficult to turn. The present invention is intended to solve the above problems.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides a float on the ground side of a mobile work machine body so that the float can move up and down, senses fluctuations in ground pressure applied to the float, and moves the work machine body up and down via wheels. It is equipped with a swing control valve that controls the supply of pressure oil to the hydraulic cylinders, and this swing control valve lifts the work machine body to a predetermined height by lowering the wheels with a lift control lever that is operated separately when not in operation. As described above, in the mobile work machine that supplies a predetermined amount of pressure oil to the hydraulic cylinder, the hydraulic cylinder adds pressure oil to the predetermined amount of pressure oil with another control valve, and the work performed by the hydraulic cylinder It is characterized in that the lift amount of the machine body is controlled to be further increased.

[Action]

With the above structure, the machine control device for the mobile work machine of the present invention has the swing control valve in the neutral position with the wheels lowered and the work machine main body lifted during non-work such as when the machine turns, and the rice transplanter Even when the machine (moving work machine) is deeply caught, the hydraulic cylinder works to enable a further lift operation, and the machine can easily turn.

【Example】

An embodiment of the present invention will be specifically described below with reference to the drawings. In the figure, reference numeral 1 is a main body of a walk-behind rice transplanter, and an engine 3 is mounted on a front frame 2 thereof. In the middle of connecting the front frame 2 and the rear frame 4, there is a mission 5 which is a part of the constituent members of the rice transplanter body 1. Power is transmitted from the engine 3 to the mission 5 via a belt transmission system 6. A hydraulic mechanism 7 is provided on the mission 5 and is driven by the power from the mission 5. Gearboxes 8 and 8 are provided on both sides of the mission 5, that is, on both sides of the rice transplanter main body 1, and chain cases 9 and 9 which also serve as swinging arms are provided in the gearboxes 8 and the front end thereof is pivoted to the mission 5. The wheels 10 and 10 are pivotally supported at the rear end thereof. The traveling drive force is transmitted from the mission 5 to the wheels 10, 10 via a chain transmission system provided in the chain cases 9, 9. Further, in the mission 5, power is transmitted to a planting section 11 provided at a rear portion of the rice transplanter main body 1 through a transmission system provided in the rear frame 4. The chain cases 9 and 9 are provided with interlocking arms 12 and 12, respectively.
The balance 14 is connected and pivotally connected to a piston rod 16 of a hydraulic cylinder 15. Then, swing control of the chain cases 9 and 9 is performed by the supply of pressure oil to the hydraulic cylinder 15, the wheels 10 and 10 are lowered relative to the rice transplanter main body 1, and the pressure from the hydraulic cylinder 15 is reduced. When the oil is released, the chain cases 9 and 9 are swing-controlled in reverse, so that the wheels 10 and 10 are lifted relative to the rice transplanter main body 1 (due to the body load). Below the rice transplanter main body 1, a sensor float 17 having a ground leveling function is arranged.
Has a rear portion pivotally supported by the rice transplanter main body 1 by a pivot 18, and a front portion thereof is connected to the rice transplanter main body 1 via a bending and stretching link mechanism 19. A sensor rod 20 extends upward from the float 17 and is connected to an operation arm 22 of a swing control valve (spool type) 21. Pressure oil is supplied from the hydraulic pump 23 to the swing control valve 21, and the pressure oil returns to the hydraulic tank 25 via the release circuit 24. The hydraulic cylinder 15 is connected to the inside of the main cylinder 15a and the passage 26
It is equipped with another sub-cylinder chamber 27 that communicates via
In the sub cylinder chamber 27, a free piston 29 elastically held by a spring 28 is provided. A switching valve 30 arranged between the hydraulic pump 23 and the swing control valve 21 is communicated with the sub-cylinder chamber 27 at a position facing the free piston 29. This switching valve 30 is used for hydraulic pumping the sub cylinder chamber 27.
23, and the auxiliary cylinder chamber 27,
It is a spool valve of a type that can perform two switching controls between a hydraulic pump 23 and a position where the swing control valve 21 branches and communicates with each other.
It is operated by lever 31 which is also used as a planted clutch lever, hydraulic lever, side clutch lever, etc. For this reason,
A control wire 32 connects the switching valve 30 and the control lever 31. Further, the lever 31 also functions as a lift control lever for switching the swing control valve 21 to lower or lift the rice transplanter body 1, and a long hole 33 provided in the operation arm 22 of the swing control valve 21. The operation pin head 35 at one end of the control wire 34 is inserted into the above, and the other end of the control wire 34 is connected to the lever 31 so that they are connected to each other. Further, the lever 31 turns on / off the planted clutch and the side clutch, and the wheels 10, 1 via the control valve 21.
Position 0 holds the hydraulic cylinder 15 at the neutral position with the sensor float 17 in contact with the paddy field, and a predetermined amount of pressure oil is supplied to the hydraulic cylinder 15 via the control valve 21. Extend the wheel 16 by a predetermined amount to rotate the wheels 10,10
The rice transplanter main body 1 is switched to a position where it is lifted to a predetermined height via the, and the switching valve 30 is switched by another operation stroke to supply the pressure oil from the hydraulic pump 23 to the sub cylinder chamber 27, and the free piston 29 to the spring 28 as shown in Fig. 3.
Hydraulic cylinder that moves the rice transplanter main body 1 to a predetermined height by moving the pressure oil that had been in the sub-cylinder chamber 27 up to the main cylinder 15a through the passage 26 until the rice transplanter main body 1 is lifted. Further expand the pistons 16 of 15 to make the rice transplanter body 1
Is designed to be lifted higher. In the walk-behind rice transplanter having such a structure, both the wheels 10 and 10 are moved up and down on the sensor float 17 during the planting work due to the fluctuation of the depth and unevenness of the cultivator, and the ground contact pressure with the paddy field corresponding to the up and down movement. Therefore, the float 17 that senses this causes the operation arm 22 to rotate via the sensor rod 20,
The switching operation of the swing control valve 21 in the neutral position is performed. At this time, the switching valve 30 keeps the pressure oil pump 23 and the swing control valve 21 in communication with each other, and the auxiliary cylinder chamber 27
The free piston 29 therein is moved leftward in FIG. 3 by the pressure oil supplied from the main cylinder 15a through the passage 26. Then, when the ground pressure of the sensor float 17 on the rice field exceeds the ground value, the swing control valve 21 is switched and pressure oil is supplied to the hydraulic cylinder 15, so that the balance 14, the interlocking rod 13, and the interlocking arm 12 are connected. Through the chain case 9, the wheels 10 are lowered relative to the rice transplanter body 1. As a result, when the ground pressure with the rice field returns to the set value,
The swing control valve 21 is at the neutral position, and the pressure oil in the hydraulic cylinder 15 is blocked. Also, when the ground pressure with the rice field falls below the set value, the swing control valve 21 is switched and the corresponding hydraulic cylinder
Since the pressure oil of 15 is released, the chain cases 9,9 swing due to the vehicle body load applied to the wheels 10,10,
Relative to the rice transplanter body 1. Further, when it is necessary to lift the rice transplanter main body 1 at the time of turning the headland of the aircraft, for example, the planting clutch is operated to “off”, and the control wire is operated by operating the lever 31.
The pin head 35 is operated via 34, the operation arm 22 is further rotated at the end of the tension hole 33, and pressure oil is supplied until a predetermined amount of pressure oil is supplied to the hydraulic cylinder 15. Then, when a predetermined amount of pressure oil is supplied to the hydraulic cylinder 15 and the rice transplanter main body 1 is lifted, the swing control valve 21 is returned to the neutral position by the operation of the lever 31, and the rice transplanter main body 1 is moved.
Completes the predetermined amount of lift operation. In this lifted state, when the rice transplanter fits deeply and the rice transplanter main body 1 needs to be further lifted, the lever 31 is rotated to the range of another set operation stroke. With this, the switching valve 30 is switched, pressure oil is supplied to the back of the sub cylinder chamber 27, the free piston 29 is moved against the spring 28, and the pressure oil is pushed out into the hydraulic cylinder 15 through the passage 26. Extend the piston rod 16. As a result, the rice transplanter main body 1 is lifted even higher, the rice transplanter main body 1 is removed from the depth, and headland turning is performed without hindrance. In the figure, reference numeral 36 is a check valve and 37 is a release valve. In the above embodiment, the case where the present invention is applied to the walk-behind rice transplanter has been described, but the present invention can be similarly applied to other mobile work machines having a sensing float and traveling wheels.

【The invention's effect】

As described in detail above, the present invention further reduces the hydraulic pressure when the swing control valve is in the neutral position with the work machine main body lifted by a certain amount by lowering the wheel during non-work such as turning the headland of the machine. Since the cylinder is used to enable a further lift motion, even if the working machine is deep in the headland while turning and the working machine fits in that depth, the hydraulic cylinder is used to move the working machine body further. It can be lifted and pulled out from its depth for smooth turning work.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a configuration diagram of a hydraulic control system. 1 ... Rice transplanter main body, 2 ... Front frame, 3 ... Engine, 4
... rear frame, 5 ... mission, 6 ... belt transmission system,
7 ... Hydraulic mechanism, 8 ... Gear box, 9 ... Chain case,
10 ... Wheels, 11 ... Planting part, 12 ... Interlocking arm, 13 ... Interlocking rod, 14 ... Balance, 15 ... Hydraulic cylinder, 15a ... Main cylinder, 1
6 ... Piston rod, 17 ... Sensor float, 18 ... Axis, 1
9 ... Bending / expanding link mechanism, 20 ... Sensor rod, 21 ... Swing control valve, 22 ... Operation arm, 23 ... Hydraulic pump, 24 ... Release circuit, 25 ... Oil tank, 26 ... Passage, 27 ... Sub cylinder chamber, 28 ... Spring , 29 ... Free piston, 30 ... Switching valve, 31 ... Control lever, 32 ... Control wire, 33 ...
Long hole, 34 ... Control wire, 35 ... Pin head, 36 ...
Check valve, 37 ... Release valve.

Claims (1)

[Claims] 1. A hydraulic oil for a hydraulic cylinder, which is provided on a ground side of a mobile work machine main body so as to be vertically movable, detects a ground pressure fluctuation applied to the float, and vertically moves the work machine main body via wheels. A swing control valve for controlling supply is provided to the hydraulic cylinder so that when not working, the lift control lever is operated separately to lower the wheels to lift the working machine body to a predetermined height. In a mobile work machine that supplies a predetermined amount of pressure oil, the hydraulic cylinder adds pressure oil to a predetermined amount of pressure oil with another control valve to further increase the lift amount of the working machine body by the hydraulic cylinder. A body control device for a mobile work machine, which is configured to be controlled as described above.