JPH01229105A - Hydraulic device - Google Patents

Abstract

PURPOSE:To make it possible to keep the horizontal state of a machine body by connecting the piston rod side chamber of the double acting type hydraulic cylinder of a propeller machine, etc. for agriculture to the cylinder chamber of a single acting type hydraulic cylinder and connecting change valves to each chamber of the double acting type hydraulic cylinder respectively. CONSTITUTION:The piston rod side chamber of a double acting type hydraulic cylinder 1 and the cylinder chamber of a single acting type hydraulic cylinder 2 are connected each other and each chamber of the double acting type hydraulic cylinder 1 is connected to a pump 6 via respective change valve 3, 4 and a flow dividing valve 5. Accordingly, with keeping the change valve 4 under a neutral state, if the change valve 3 is switched to the position (A), piston rods 1a, 2a are simultaneously projected and a machine body can be kept horizontally.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a hydraulic system used in agricultural propulsion machines and civil engineering propulsion machines.

Prior Art When controlling the pitching and rolling of a work machine using a conventional hydraulic system, if the work machine is directly attached to a traction device, the left and right propulsion wheels must be moved up and down simultaneously to raise and lower the machine. It was controlled by a hydraulic system that moved up and down to change the tilt of the aircraft from side to side. In addition, in the case where the left and right axles were linked by a balance device, an independent hydraulic device was installed to change the inclination of the balance. Furthermore, in the case where a work implement is attached to the towing vehicle body via an elevating link mechanism and a rolling mechanism, the pitching and rolling thereof are specifically controlled by a hydraulic device.

Problems to be Solved by the Invention In any case, in the prior art, during the pitching control operation, it was not possible to fluently control the working machine so that it would not naturally tilt left or right. That is, rolling and pitching are performed at the same time within the rotation time, making it difficult to maintain the work machine in an initial state horizontal to the machine body.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a first invention in which a double-acting hydraulic cylinder device and a single-acting hydraulic cylinder device are combined into a piston of the double-acting hydraulic cylinder device. The cylinder chamber side, whose volume is narrowed when it is ejected, and the cylinder chamber of the single-acting hydraulic cylinder device are made into linked piping,
When feeding hydraulic oil into a double-acting hydraulic cylinder device, the cylinder chamber on the proximal end where the piston protrudes and the cylinder chamber on the distal end where the piston retracts can be independently supplied with or drained of hydraulic oil. The hydraulic system is provided with a special first hydraulic switching valve and a second hydraulic switching valve that can be turned on or off.

Moreover, in the second invention, ti! The dynamic bending pressure cylinder device and the single-acting hydraulic cylinder device are combined by linking the cylinder chamber side of the double-acting hydraulic cylinder device, whose volume is narrowed when the piston protrudes, and the cylinder chamber of the single-acting hydraulic cylinder device. A first hydraulic switching valve capable of supplying hydraulic oil, discharging oil, or stopping the hydraulic oil only to the proximal cylinder chamber from which the piston protrudes when feeding hydraulic oil to the dynamic hydraulic cylinder device. In addition to this first hydraulic switching valve, a second hydraulic switching valve is provided in the base side cylinder chamber and the tip side cylinder chamber, which can be switched to each state of oil supply, oil drain, and stop. .

In the third invention, the double-acting hydraulic cylinder device and the single-acting hydraulic cylinder device are separated into a cylinder chamber side where the volume is narrowed when the piston of the double-acting hydraulic cylinder device is protruded, and a cylinder chamber side of the single-acting hydraulic cylinder device. When the hydraulic oil of the double-acting hydraulic cylinder device is fed, hydraulic oil is supplied independently to the proximal cylinder chamber from which the piston protrudes and to the distal cylinder chamber from which the piston retracts. A special first hydraulic switching valve and a second hydraulic switching valve are provided, which can be set to a state where oil is drained, drained, or stopped. The first and second hydraulic switching valves are hydraulic devices linked to a detector for the up-and-down state of the propulsion surface so as to control the vertical movement and horizontal tilting of the vehicle.

Furthermore, in the fourth invention, the double-acting hydraulic cylinder device and the single-acting hydraulic cylinder device are connected to the cylinder chamber side where the volume is narrowed when the piston of the double-acting hydraulic cylinder device is protruded, and the cylinder of the single-acting hydraulic cylinder device. The piping is connected to the cylinder chamber, and only the cylinder chamber on the base end side from which the piston protrudes when feeding the hydraulic oil of the double-acting hydraulic cylinder device can be supplied with hydraulic oil, drained of oil, or stopped. Separately from the first hydraulic switching valve, there is provided a second hydraulic switching valve that can switch the base side cylinder chamber and the distal side cylinder chamber to each state of oil supply, oil drain, and stop. and the first and second hydraulic switching valves are configured as detectors for the ups and downs of the propulsion surface so that the single-acting hydraulic cylinder device and the double-acting hydraulic cylinder device control the vertical movement and left/right tilting of the body of the propulsion work device. It is a hydraulic system that works in conjunction with each other.

Effects and Effects of the Invention According to the first invention, the second hydraulic switching valve that communicates with the cylinder chamber on the tip side of the double-acting hydraulic cylinder is fixed in the "off" state so that it does not communicate with the cylinder chamber side, and the base When hydraulic oil is sent into the side cylinder chamber by the first hydraulic switching valve, the hydraulic pressure in the tip side cylinder chamber of the double-acting hydraulic cylinder and the cylinder chamber of the single-acting hydraulic cylinder becomes the same, and the pistons of both cylinder devices are the same. stand out like that. Conversely, when the hydraulic oil is returned to the tank side with the first hydraulic switching valve, both pistons retract in the same way.

In addition, when the first hydraulic switching valve is fixed in the "off" state and the second hydraulic switching valve sends hydraulic oil into the cylinder chamber on the tip side of the double-acting cylinder device, the piston of the single-acting cylinder device protrudes, causing the reverse When the hydraulic oil is returned to the tank side, the piston of the single-acting cylinder device can be retracted. Furthermore, if the first and second hydraulic switching valves are not fixed and are switched as described above, the speed at which one piston protrudes or retracts relative to the other piston can be changed.

In the second invention, in addition to the above-mentioned first effect, both pistons can be both protruded at high speed and retracted at high speed.

As described above, the first invention and the second invention are capable of protruding or retracting both pistons of both hydraulic cylinder devices in the same state by a combination of two hydraulic switching valves, and by a combination of two hydraulic switching valves. It has the unique effect of being able to output and enter only one turn, and furthermore, change the speed of its exit and entry.

The third and fourth inventions are those in which the first invention or the second invention is adopted in a machine body attitude control device for an agricultural working machine, and in which the first hydraulic switching valve and the second hydraulic switching valve are combined with each other. The ideal posture control is achieved by switching between a detector that detects the ups and downs of the tiller and topsoil surface in the front and rear directions of the field, and a detector that detects the ups and downs in the left and right directions of the field. It is possible to maintain stable attitude control by maintaining a constant state in which the aircraft support pressure is constant.

Example An embodiment of the present invention will be described in detail based on the drawings.

First, FIG. 1 shows a hydraulic circuit of an embodiment of the hydraulic system of the first invention, in which 1 is a double-acting hydraulic cylinder device, 2 is a single-acting hydraulic cylinder device, 3 is a first hydraulic switching valve, and 4 is a hydraulic cylinder device. A second hydraulic switching valve, 5 a diverting valve, 6 a hydraulic pump, and 7 a tank.

FIG. 2 shows a hydraulic circuit showing an embodiment of the hydraulic system of the second invention.

In the first invention, when the second hydraulic switching valve 4 is kept in the neutral state as shown in the figure and the first hydraulic switching valve 3 is switched in the direction of arrow (A), the base of the double-acting hydraulic cylinder device 1 Hydraulic oil is fed into the side cylinder chamber, and the pistons la and 2a protrude while the oil pressures in the tip side cylinder chamber of the cylinder device 1 and the base side cylinder chamber of the single-acting hydraulic cylinder device 2 become the same pressure. Conversely, if the first hydraulic pressure switching valve 3 is switched in the opposite direction of the arrow (A), when a load is applied to each piston, the hydraulic pressure in both cylinder chambers will change at the same pressure, and the pistons], a, and lb will change at the same time. We will withdraw together.

Next, when the first oil pressure switching valve 3 is left in the neutral state shown in the figure and the second oil pressure switching valve 4 is switched in the direction of the arrow (b), the piston la does not move in and out in that state. Piston 2a protrudes. Furthermore, when the second hydraulic pressure switching valve 4 is switched in the opposite direction of the arrow (b), only the piston 2a is retracted.

Next, when the first hydraulic switching valve 3 is switched in the direction of arrow (a) and the second hydraulic switching valve 4 is switched in the direction of arrow (b),
Piston 2a protrudes at a higher speed than piston 1a.

Furthermore, the first hydraulic switching valve 3 is moved in the opposite direction of arrow (A), and
When the second hydraulic pressure switching valves 4 are both switched in the opposite direction of the arrow (b), the piston 2a is retracted at a higher speed than the piston 1a.

Next, when the first hydraulic switching valve 3 is switched in the direction of the arrow (A) and the second hydraulic switching valve 4 is switched in the opposite direction of the arrow (B), the piston 1a protrudes and the piston 2a retracts at a low speed. Further, when the first hydraulic switching valve 3 is switched in the opposite direction of the arrow (A) and the second hydraulic switching valve 4 is switched in the direction of the arrow (B), the piston 1a is retracted while the piston 2a is in a stopped state.

In the case of the second invention, in addition to the first invention, the second hydraulic switching valve 4a is configured to be able to send and discharge hydraulic oil into the cylinder chamber on the base side of the double-acting hydraulic cylinder device 1. Therefore, in addition to the first invention, the operating speed of the pistons la and 2a can be rapidly extended or retracted.

The third invention and the fourth invention are those in which the hydraulic systems of the first and second inventions are used to control the vertical and horizontal tilting of agricultural working machines, and a walking type rice transplanter according to one embodiment thereof is used. This will be explained in detail with reference to FIGS. 3 to 5. A traveling transmission case 8 is integrally attached to the output shaft protruding side of the engine 9, and the internal transmission mechanism is configured to transmit power thereto. A swing transmission case 10a that can rotate around a drive shaft protruding left and right on both sides of the mission case 8.
, 10b are provided, and a paddy wheel 11a is provided on the outer side of the tip side thereof.
llb is installed so that it is transmitted. A frame 12 whose base is fixed to the case 8 and extends rearward is provided at the rear of the mission case 8, and a bar handle 13 whose rear end side is swung upwards and which extends left and right at the tip thereof is provided.
is firmly attached.

A planting transmission case 14 is fixed to the frame 12, and planting devices 15 and 15 are attached to both left and right sides. 1
Reference numeral 6 denotes a seedling stand, whose back side is supported by a frame 12 and a handle 13 so as to be laterally movable, and which is tilted so that its front side is on the lower side. A connecting fitting 18.1 is connected to the moving shaft 17 connected to the left and right reciprocating mechanism in the planting transmission case 14.
8 and is configured to be reciprocated from side to side. The seedlings to be placed are supplied to the planting devices 15, 15.

A hydraulic unit A, which is a unit of the first hydraulic switching valve 3, a double-acting hydraulic cylinder device 1, and a single-acting hydraulic cylinder device @2, is mounted on the top of the traveling mission case 8 with the pistons la and 2a facing rearward. An arm 18a and a piston 1a are connected to each other by a rod 19a, and an arm 18b is integrally provided to the swing transmission case 10b.
and piston 2a are connected by rod 19b to form piston 1.
When a protrudes, the paddy wheel 11a descends, and the piston 2a
The structure is such that when the paddy wheel 11b protrudes, the paddy wheel 11b descends. In addition, the first hydraulic switching valve 3 includes a ground leveling float 20 which is located between the left and right paddy axles and is attached to the machine body so that its front part can swing up and down, and its switching arm 21 are connected by a rod 22. When the side is pushed up and approaches the fuselage within a certain range, the first hydraulic switching valve 3 is switched in the direction of arrow (A), and both pistons la are switched.

2a are made to protrude together, the paddy wheel handles 11a and 11b are lowered to raise the aircraft, and conversely, the float 20 is lowered and the first hydraulic switching valve 3 is separated from the aircraft by more than a certain range as indicated by the opposite arrow (b). both pistons la and 2a
The paddy axles 11a and llb are raised by retracting both of them, and the aircraft is lowered.

The second oil pressure switching valve 4 is configured to be switched by the left and right rotation of a shaft 25 that is pivotally supported via a bracket 24 at the lower part of a stand 23 that receives the engine 9. A weight 27 is attached to the lower end of an arm 26 that is integral with the shaft 25, so that the valve 4 is switched when the aircraft tilts left or right beyond a certain level. That is, when the aircraft is tilted so that the right side is lower, the switching valve 4 is switched in the direction of the arrow (b) to project the piston 2a and move the right side paddy axle 1.
1b is lowered to restore the inclination of the aircraft, and when the aircraft tilts to the left, the switching valve 4 is switched in the opposite direction of arrow (b) so that the aircraft is always in a horizontal state.

Therefore, in the embodiments of the third and fourth inventions, the paddy wagon 1! The rice paddy axles 11a and llb rotate in contact with the tiller in the paddy field, propelling the machine while performing rice planting work, but if the plowing surface that the paddy axles 11a and llb come into contact with is moving in the front and back direction, the rice field will be leveled. The float 20 detects this and controls the machine to move up and down, and when the tiller surface is tilted to the left and right, the machine tilts to the left and right, so this is the relationship between the arm 26, which is always suspended by the weight 27, and the tilt of the machine. The rotation of the shaft 25 is detected, and the tilting of the aircraft body is controlled to be horizontal.

That is, when the tiller becomes deeper, the soil leveling float 20 is pushed up and the first hydraulic switching valve 3 is pushed up via the rod 22 and the arm 21.
is switched in the direction of arrow (A), and both pistons la and 2a protrude, causing the paddy wheel 11a.

Lower 11b and raise the aircraft to level the ground float 20.
Raise the aircraft until the ground pressure is appropriate. Conversely, when the plowing platform becomes shallow and the soil leveling float 20 descends, the first
The hydraulic switching valve 3 is switched in the opposite direction of the arrow (A), the pistons la and 2a are both retracted, the paddy axles 11a and llb are raised, and the aircraft is lowered until the soil leveling pressure of the ground leveling float 20 becomes appropriate. lower it.

Also, if the right plowing platform becomes deeper and the aircraft tilts to the right,
The valve shaft of the second hydraulic switching valve 4 is switched in the direction of the arrow (b) pushed in by the relative rotation of the shaft 25, which is integrated with the arm 26 on which the weight 27 is suspended, with respect to the machine body, and the piston 2a protrudes, and the piston 2a protrudes. The wheels 11b move down and the right side of the aircraft is raised to return the aircraft to a horizontal state. Conversely, when the aircraft tilts to the left, the second hydraulic switching valve 4 is switched in the opposite direction of the arrow (b), retracts the right piston 2a, moves the right wheel 11b upward, and lowers the right side of the aircraft to move the aircraft. Return to horizontal position.

When the tiller is moving back and forth and left and right at the same time, the above-mentioned operations are performed at the same time to rapidly control the machine to an ideal attitude.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention. Figures 1 and 2 are hydraulic circuit diagrams, Figure 3 is a side view of the walking rice transplanter, Figure 4 is its plan view, and Figure 5. is a front view of the main part. In the figure, symbol 1 is a double-acting hydraulic cylinder device, 1a and 2a are pistons, 2 is a single-acting hydraulic cylinder device, 3 is a first hydraulic switching valve, 4 is a second hydraulic switching valve, 5 is a flow divider valve, and 6 is a Hydraulic pump,
7 is a tank, 20 is a leveling float which is an example of a detector,
27 indicates a weight for detecting the horizontal state.

Claims (4)

[Claims] (1). A double-acting hydraulic cylinder device and a single-acting hydraulic cylinder device are combined by linking the cylinder chamber side of the double-acting hydraulic cylinder device, whose volume is narrowed when the piston protrudes, and the cylinder chamber of the single-acting hydraulic cylinder device, and When feeding hydraulic oil into a dynamic hydraulic cylinder device, the cylinder chamber on the proximal end where the piston protrudes and the cylinder chamber on the distal end where the piston retracts can be independently supplied with hydraulic oil or drained. Alternatively, a hydraulic system is provided with a first hydraulic switching valve and a second hydraulic switching valve that can be brought into a stopped state. (2). A double-acting hydraulic cylinder device and a single-acting hydraulic cylinder device are combined by linking the cylinder chamber side of the double-acting hydraulic cylinder device, whose volume is narrowed when the piston protrudes, and the cylinder chamber of the single-acting hydraulic cylinder device, and A first hydraulic switching valve is provided only in the base-end cylinder chamber from which the piston protrudes when feeding hydraulic oil to the dynamic hydraulic cylinder device, which allows the hydraulic oil to be supplied, drained, or stopped. , a hydraulic device which is provided with a second hydraulic switching valve that can be switched to oil supply, oil drain, and stop states in the base side cylinder chamber and the tip side cylinder chamber, separately from the first hydraulic switching valve. (3). A double-acting hydraulic cylinder device and a single-acting hydraulic cylinder device are combined by linking the cylinder chamber side of the double-acting hydraulic cylinder device, whose volume is narrowed when the piston protrudes, and the cylinder chamber of the single-acting hydraulic cylinder device, and When feeding hydraulic oil into a dynamic hydraulic cylinder device, the cylinder chamber on the proximal end where the piston protrudes and the cylinder chamber on the distal end where the piston retracts can be independently supplied with hydraulic oil or drained. Alternatively, a special first hydraulic switching valve and a second hydraulic switching valve that can be brought into a stopped state are provided, and the single-acting hydraulic cylinder device and the double-acting hydraulic cylinder device control the vertical movement and horizontal tilting of the propulsion work device. A hydraulic system in which the first and second hydraulic switching valves are linked to an undulating state detector of a propulsion surface. (4). A double-acting hydraulic cylinder device and a single-acting hydraulic cylinder device are combined by linking the cylinder chamber side of the double-acting hydraulic cylinder device, whose volume is narrowed when the piston protrudes, and the cylinder chamber of the single-acting hydraulic cylinder device, and A first hydraulic switching valve is provided only in the base-end cylinder chamber from which the piston protrudes when feeding hydraulic oil to the dynamic hydraulic cylinder device, which allows the hydraulic oil to be supplied, drained, or stopped. Separately from this first hydraulic switching valve, a second hydraulic switching valve is provided in the base side cylinder chamber and the tip side cylinder chamber, which can be switched to each state of oil supply, oil drain, and stop, and the single acting hydraulic cylinder device and a double-acting hydraulic cylinder device, the first and second hydraulic switching valves are interlocked with a propulsion surface undulation state detector so that the lifting and lowering and left-right tilting control of the body of the propulsion work device is performed by the double-acting hydraulic cylinder device.